Sánchez-Ruiz, Jorge2010-01-222010-01-221998-07-20Physics Letters A, 1998, vol. 244, n. 4, p. 189-1950375-9601https://hdl.handle.net/10016/6593The exact lower bound on the sum of the information entropies is obtained for arbitrary pairs of observables in two-dimensional Hilbert space. The result coincides with that given by Garrett and Gull for the particular case of real transformation matrices and state vectors. A weaker analytical bound is also obtained.text/htmlengUncertainty principleQuantum measurementsEntropyOptimal entropic uncertainty relation in two-dimensional Hilbert spaceresearch articleMatemáticas10.1016/S0375-9601(98)00292-8open access